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Studies on Tool Shoulder Diameter of Dissimilar Friction Stir Welding Copper to Stainless Steel

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Abstract

This study attempts to investigate the joint efficiency of dissimilar friction stir welds such as electrolytic tough pitch copper to stainless steel (SS) by focusing on identifying the optimum tool shoulder diameter which would provide higher strength joints. Four different shoulder diameters such as 16, 18, 20, and 22 mm of friction stir welding tool are investigated for rest of the constant process parameters. An experimental approach is adopted for the present investigation of dissimilar friction stir welding, and its quality is assessed based on microstructure analysis, mechanical tests along with scanning electron microscopy used to identify the fracture mechanics after failure. Defect-free joints were attained for the weld obtained by 18 mm tool shoulder diameter. Besides, the tool shoulder diameters of 16, 20, and 22 mm were found less suitable for dissimilar Cu–SS welds as decreased joint strength. Maximum joint efficiency (76%) and ultimate tensile strength (173 Mpa) were reported for welds with the 18 mm shoulder tool.

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Acknowledgements

The authors would like to express their thanks to Mr. Rajesh Nair for helping to improve the language of this manuscript. Authors are very much thankful to Dr. Kush Mehta for his significant help in paper writing and results interpretation. The authors are also thankful to Board for Research in Fusion Science and Technology (BRFST), Institute for Plasma Research (IPR), Gandhinagar for sponsoring the research project through project number NFP/MAT/A10/04.

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  1. Department of Mechanical Engineering, School of Technology (SOT), Pandit Deendayal Petroleum University (PDPU), Raisan, Gandhinagar, Gujarat, 382007, India

    Gaurang R. Joshi & Vishvesh J. Badheka

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Correspondence to Gaurang R. Joshi.

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Joshi, G.R., Badheka, V.J. Studies on Tool Shoulder Diameter of Dissimilar Friction Stir Welding Copper to Stainless Steel. Metallogr. Microstruct. Anal. 8, 263–274 (2019). https://doi.org/10.1007/s13632-019-00532-5

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